Product Description

Fitting somewhere on the spectrum between a light jacket and your warmest jersey, our most technical jersey gets a significant performance upgrade this year.

RoS stands for Rain or Shine. It’s a label we give our most advanced products that excel in both dry and wet conditions. For dry conditions, you’re looking for comfort along with breathability to prevent you from getting wet and chilled from the inside. But with wet-weather clothing, you’re looking for protection that will help you stay warm by keeping the rain out and letting sweat escape. The Alpha RoS jersey ticks both of those boxes.

Both the front and back materials are brand new this season and represent a significant step forward in rain protection. These fabrics are used with reduced seaming, and seam sealing where necessary. We call this “functional waterproofing” because while we don’t guarantee that no drop will ever enter the jacket, we promise you that this is our best effort to keep you warm and dry in the widest range of conditions.

Key Features:

Lightweight double-layer wind jersey with significant rain protection

Windstopper® 150 front and sleeves

Nano Flex Xtra Dry back for the most significant nonmembrane water protection available

ProSecco Strada inner liner with 2nd front zip

Waterproof YKK® Vislon® zipper

Articulated collar that fits better whether you’re standing or riding

Front zippered pocket

3 rear pockets with reflective laser-cut drain holes

Raw-edge waist lies flat and moves with you

Advanced patterning makes for excellent close-to-body fit

Weight: 380g

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Castelli Size Chart

Castelli Clothing Sizing Guide

Use the Castelli size chart to find the best fit for you.

Note: Castelli size their clothing small. To ensure an optimal fit it is recommended you go up one size, compared to your normal cycle clothing size.

Long Sleeve Jersey Guide

Long Sleeve Jersey Guide

Why wear a long sleeve cycling jersey?

For those cooler rides a long sleeve jersey is what you need to stay comfortable on the bike. Some zippered road cycling jerseys have extra thermal properties for more warmth on those really cold days. While Long sleeve MTB jerseys are also a good option for a little extra warmth, some mountain bike tops are made for warmer weather riding. Popular with gravity riders these jerseys often have reinforced panels offer a little extra protection.

You can either wear a long sleeve jersey on its own or on top of a short sleeve jersey. Long sleeve jerseys come in different fits to suit specific cycling disciplines and riding styles. Like short sleeve cycling jerseys, most long sleeves also feature high-wicking technical fabrics to move sweat away from your skin.

To help you navigate the world of cycling jerseys, we’ve put together this long sleeve jersey guide, so you can find the right top for your next ride.

Jersey Fit

Race/Athletic Fit

Slim fitting. These figure-hugging jerseys are cut so that there is no excess material to flap about disrupting the air flow around your body as you ride. You can easily spot these jerseys by their figure-hugging design. Race fit long sleeve jerseys are ideal for road cycling as well as cross-country mountain biking.

When worn next to the skin the form fit helps to draw moisture away from the body, so that it evaporates quickly keeping you cool as you ride.

Loose/Casual Fit

These looser fitting jerseys prioritise comfort on the bike with less concern to aerodynamics. Ideal for mountain bike trail and gravity riding, loose fitting jerseys are usually a pullover design. Stretch fabrics make them easy to take on and off.

These MTB style jerseys also look good off-the-bike, so they are good for leisure cycling and urban cycling too.

Articulated Construction

The best jerseys will be constructed with articulated areas that are specific for cycling. Whether you are road cycling or mountain biking you will want a jersey that fits well on the bike.

Cycling jerseys are cut slightly shorter at the front to prevent fabric bunching up and longer at the rear, so you don’t expose your lower back. This is most noticeable on race fit road cycling jerseys. You may also find jerseys with a crook built into the elbow area for a more comfortable fit on the arms.

Materials & Fabrics

Most cycling jerseys are constructed from man-made fabrics such as polyester and / or nylon. You can also buy jerseys made from natural fibres such as Merino wool. Synthetic and natural fibres have different benefits, so it’s worth choosing a type which is best for you.

Synthetic Materials(Polyester, Nylon etc...)

Quick Wicking

Very breathable

Fast drying

Easy care & washing

Durable & long lasting

Flexible for freedom of movement

Affordable

Get smelly quickly

Natural Materials(Cotton, Wool, Merino...)

Breathable

Soft & strong

Ideal for sensitive skin(wool can be itchy)

Wool retains body heat when wet

Naturally odour resistant

Does not wick quickly (Merino wool does)

Wool can be restrictive

Synthetic materials are ideal for performance jerseys where you want a form fit, and you want to stay dry and cool for longer. Natural fibres are ideal if you ride at a less intense pace and you cycle daily as they don’t smell as quickly. You can also by poly-cotton jerseys which combine the benefits of both types of fibre. These jerseys won’t shrink in the wash and they’ll keep their shape and colour.

Jersey types

Long sleeve road cycling and mountain biking jerseys are quite distinct, and riders will wear them at different times of the year.

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Representative example: If total purchase price is £1,399.00 with a deposit of £139.90 (10%) and your selected term is 36 months Classic Credit (15.9% APR fixed), you would pay £43.55 per month. Total charge for credit will be £308.70 and total amount repayable is £1567.80, subject to terms and status.

Delivery & Guarantee

Christmas Delivery

We will try our very best to get your products delivered to you before Christmas, but due to Santa's overspill into our delivery services, we would like to make you aware that while we are making every effort to deliver your order to you in time for Christmas, there may be a potential risk of delay.

The last date to order a bike that is available for Christmas delivery is 5pm on Tuesday 18th December. For all other items the last date to order items that are available for Christmas delivery is 12pm on Wednesday 19th December.

You can easily spot which items are guaranteed for Christmas delivery with theicon. Choose your size and colour to see if the item qualifies for Christmas delivery.

UK Delivery Information

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE to mainland UK, regardless of the size and on all orders over £20.

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V12 Representative Example: If total purchase price is £1,399.00 with a deposit of £139.90 (10%) and your selected term is 36 months Classic Credit (15.9% APR fixed), you would pay £43.55 per month. Total charge for credit will be £308.70 and total amount repayable is £1567.80, subject to terms and status.

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